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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '048a24e26c70b3b8cfbf0324655655813d651d2ca74a0430f88e930513024e6c' 
  AND token = 'ycoupaGMfB3STfq5yauQ+bcYCIec5rMbpAhOLcohe8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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