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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef9ea8b7f21599eeccf61748568242f80276e3a631835373b71dd8511653f948' 
  AND token = 'EwO/cCgnU2m5GTlYDkUo87QaTDU75Xyur57+aigHJGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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