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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b9e15ae3f856e56b956fe1a286fe866e7b6dd3fa42a5d1abe6f21d38aca2a12' 
  AND token = 'npJ3z4dTezuGdt9OQUadD5EdnKzlxxy4lEh2WORJvak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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