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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '083d00580a0760565044df0cb84d4355438ffbbb592b5146e9f5c87a25c01c45' 
  AND token = '0V2cl3FZDcYWzSrjMpkh7k/0Q5HdbYh5YOyA30H3i2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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