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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0abee0b968426a0f6e86bed3e10f4088de0cc48c29a3de5e903c67c829fbe77' 
  AND token = 'pnNr+rWkukCWrDRINanV89uchvCAJJgfkl9fR93fC1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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