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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3df2c4727b3d2a2c454385cc56fbeb77c82118d57393730c0793a6a37ce0ad26' 
  AND token = 'IuoNC6A59IuwMI3OyHde3OoJ/U0l+DJPuGnIyCchdfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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