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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e01ad1ef6bdd221134a75353c42fc547d47a6bb47d8ff8c5a275f85f860107de' 
  AND token = 'HmoROk0i6Iq6YV55m19QznCcCTNmaaOOIUajeCAzLis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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