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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fb2b03a8ad0ad242f9e68a5e9193af47086868481f0646a75450b6d4c9b6311' 
  AND token = 'lfZGGubBNIkb8Ye5LG6g5ufXC8B6OqJeUX0Hts6M47c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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