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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8966622ea4d4784175ff32da845d59701b9e2d29486ab7057444ecf1e699c866' 
  AND token = 'DS4a7PhVuSX8v55a06Xz0S1Rrlu7JeraNdnKbD6bavA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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