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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7fe5ef517c9a0d8076fe93a8a2d77fd664929483c89ee276faacca5846f9d1b' 
  AND token = '9WCnyX4mavZA9zR2sUsNihET1C1bYE+vSd028wv7Myw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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