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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16f565ed9900022a9837015c963fd48f64c94aae7e4ad694d849ba402d33d43b' 
  AND token = 'Os7Er3bz0vo9X1Ad05+jl9HbrsrniAlpPAay7F8rRFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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