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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7988b7a3e423c0507c4a3b7c5050733ac0c42deb10709c67edac8f6be87a3406' 
  AND token = 'i7URKaBSU6oWEglDhE4bsIJYy8tYjgM1Vch6TbbFiqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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