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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68cfee7c4b55225e3ad0e3526c007d7047c0af431dec620c14fa4810e1594e48' 
  AND token = 'IKxuDaqu47XcAZ1h0IuXRu1ILnvHLqSpE5HH/oYeU9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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