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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72c7fa0ed1f9779d82fb794d1eae04bf8915553addcf44f429dc05bde894e1df' 
  AND token = 'OKNjEHOBFG1tnMHOLz2jD/rlFZ1he6nwW/safXni2/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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