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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a265721111aa3b7592aec42a09d486c395a424b431b53d6ec085242ed4360d7d' 
  AND token = '5VmcZqaIT4B2a8DSYV35bmA3FToZVsX8vSHa5KLlRe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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