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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '320b107d89f0bd30f029a59f4e2d0f4ae2aa4d2fa8aed16f67977dc2c6b5115e' 
  AND token = 'SDMGPLdPb/BngKUr8QRIZWUYAWLIbOxKCQKz4rpPeM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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