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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92fbe80e8fffe7967b3d5997e74038b03e41fa495fe41ca148af58b38e3a2cb4' 
  AND token = 'Piq39529FzlojmMrWBREJJbFdeerVh83IY7wQMvqY3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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