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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c01b2c5f6e3c2c06bcec4079e17bcc2938d522e47a5f3c628edd43e9c3818d' 
  AND token = '6/ZUEz07V6MHyOahh0hy2/KSd5doCZlLYVPWVKq5Mu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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