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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc1b889e8d6541db8a3fa00e4aef193b2a8d8fe6d44e276f78386f75152b319e' 
  AND token = 'PNqx+yOtvpptPqZV7coKiPZvCARyQz4fD9luDariUyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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