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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba34b53598b8cb42c197cfc2766bd910364035f6592d711ac31016e16d7e89be' 
  AND token = 'y4CfRcdckEfFLyHDvj84xyGLB9bxT1jTQ5jB7vY3zgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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