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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13a516269c91d8bb422e832dd2464929e8a5779329984f6310f2de2d3cfb6374' 
  AND token = 'Qr488uLDz/3qkjU/ac3jpEdz0Uh5ZKQx1tbRSeMxsC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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