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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1dd0b87ca51a5ba61c9530d131bfef919ce6e4e425e38fbb15c3ea06fa3f6b2' 
  AND token = 'WpANqNUhQJC6dLzaJ2AnQWi2h76t0XkqYeafn3UDb+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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