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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '872ce084a1bc0b12ae5d19eb86aff272288d33e980ab24c21d1091d37a3f0a1d' 
  AND token = 'HRHbBtrBboZOXtxZl6GuFd18FmQuXR9w/uebZ9usLV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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