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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e5b47616e7fddf94d2b2632f5c9cc4d7eb9d66393ee4003275896d4b906f246' 
  AND token = 'xh2oTK+vZN7Mp+WoVjudvBzedIbibRRSfzINx062zOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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