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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '178bfa86a2f8560d0fbc25d2acef34d26ed675a84441e0ca5381396179545a27' 
  AND token = 'EGZkA7U/gl1L5pE+ixyEwmGVwiOB9o7fSlfaoPRAJ20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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