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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '094f58e7e59e55ac0f9ce27a72608c022906cfac4d6ca4688576d92840c16fba' 
  AND token = 'CU4daTR4EN2jB5b2+GN+frjA/15UTE/qTt2t8eKON1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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