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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8687a32458872693f16e5dcc240181b6ab438a1ba477436109e783043026839e' 
  AND token = '9/BWplhnTxK51ZqBlA7QcQwflKZhOaXR7lilni2Y5os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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