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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd12a79f6312aa2c514bdf5e74631fcaac29a45a2143b339e0ee1e2ad26123e31' 
  AND token = 's1uhskaB2VJJrAN9pkBfUOIY3QfrGkjJSwF54LONu2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}