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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4c4bceaf7014c0bc09be43c1356c400f31c9611a61a287e7c94a00e63d93e1b' 
  AND token = '7UQMtvWYre3+J4Qmuu9DuK86B/aPq4UXs4g/N1A7S6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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