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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6183737a092342cd2fed620bbbec0b2b7c06030ef37c1e14d4b84e6b35a0c6d' 
  AND token = 'asNvTWHoQAkFNrvhe2r/pniqIdx5elhLAqFd5123xmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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