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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af902a38fe53f6d70f03b3cb5d34ef90c6cd2bfb55d502efdd4dc1388dbed95c' 
  AND token = 'sXy7JlRS8Bf9NvjXdk0ejqsYS/0iQd85PXcw/J6qJJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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