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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa9fdd4b3d13091a09574c907909b7c25ade911ae67158c305d5ab58be1dfcc' 
  AND token = 'pOTtsZ6Ca2OotUgcPFlx8jJlUXC6ereCsPme4iEoARs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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