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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '373013942fd60dcf4c4a054799202c5ddb39d30caa60c630e74f6a2e68c9a8d0' 
  AND token = '86kYlyfTjhGuOio+PLsEesApQiU/pZquk7E9qnz8BGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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