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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b2af8155d25cc55c3f2fb1f54474d192b89e4630f9651399099c0c48f9a97d' 
  AND token = '7TXpK60RiPwa+GfdW11I1I8+jODoQh3h8L0AgKW5cQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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