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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a9a5f3916012213c15b6676026f7c1d74afd0c7aa6fd439604495a4497c0929' 
  AND token = '8b2e5v+gAx0XII1q756qJ7Nikc4gP3UrRoMNBPlAVU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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