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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '990a1f58c8a5a7db6b74ba576977ba59bca492ebca45fd68399d967a0c93934f' 
  AND token = 'fMh5+iMs/QnAfwibosbcXfaBE96xo+v1Ke3YiKut57c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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