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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf18e2692269d1f77dce02eac527d5935984a749f0b591b1ac47dc57a5852d34' 
  AND token = 'Y2JkG1A1jJ23/iBf2DidS1ZX93B3cO8lG94anxyCcA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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