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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96361c058b2ed3f61695223ee21deb603509260eba0e076ebc9609b8b0a8a9d5' 
  AND token = 'goGqWIRsJ63nI0WTSxCPO+DKaSySSmPQfTtyTB0tA9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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