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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f5cd45d945d8a523181b47d318c5621404e513ef740952c97c5063eecd179e6' 
  AND token = 'SqgfoT3WC5t3FNmM/GXqQ9gtDRpIV1/nMjMxXJUiJ9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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