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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc9dd19664a2449e45698aa8ed3a986d3d6f33c11d0b3878a8252af7b982ed2' 
  AND token = 'IhZ8rlInA8q275DAvt5OQBOlNLP6ZG877nSLSeWAWqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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