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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c70369812c37f6c97bb5380166970325d137e7d51bfb6d55f1eaee0e404858' 
  AND token = 'Y4Q0Tv1jKQBbHMc0YD0yZP76TXl59gvSQ5EfQ47B+P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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