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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa94068b1ddee59753b45e7f2a4376d50f39e86696bb68da6d9c1f1f4080d19' 
  AND token = 'NfN3wKiOtIjJ7to3OFZtGF6dGZA16+vOuJgvc8SKdSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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