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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f36d880f3b84b27e1f0f60c345a051c51bf2bd9ac6c22d532168384d8bd602f7' 
  AND token = 'K3YyKP1LM0WH034fjPze/j7PVFhfCnLHbeYCWkgDOtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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