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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80468bc5e48d3cf982329e871aafa3d880417ccd2e2a0972134662aa41566c5a' 
  AND token = '0SQRCLHSLGiIE6j8Yi1tFq12OVmpjPU3vQYCto51iL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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