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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84287ca7bd6348efb36cbc07dd5e7237c5bff126968ead3f1549c7c6f3082562' 
  AND token = '0zD8bDnBL6w05Mdxw1f1T41csajkNJR5talndLu2uEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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