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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a00cbb09996b3c9dd21847bd6876798d3313336025f45a5479777a2ea6d89cb4' 
  AND token = 'jQ+uOFkqRaQnWTx6ikQPxqZ2wJKni1izAC9LRe36zVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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