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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9a3266d89676cf76f0eb39f33d5311e2fcbe39f6e4ae568996bcdb2ad1bf47' 
  AND token = '+NUrIZMx9FE3WR6sNckJgdJ5TZr9lcyu4Ph9bYsbCyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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