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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0730df4ea5c540ae805e2a3bd01ebcc2d4cae69fc3020ad0afe43938a1a0d838' 
  AND token = 'Y6haatl0SE0Hsnk1/8ZyXGKG7ez3lfDzgvWlh6LWHwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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