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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42d299677fa4f25ccc3e21b32adbc019fc96734dae89bf05de1555d30b09de88' 
  AND token = 'd0w8MGftPOKpxV5Ss3z1VJ7imoevktQexRtiy+QoO88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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