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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fec36607ddeabda7c849e73e244712c672157c1653f32167fc925e6a558a70f' 
  AND token = 'j8reYrGI+Nw3aAc6+Hpio+8P1ZAdz481VeIHO29k/mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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