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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e46d9e42d912691d805edb85c6a7282e493724bd7ed0ef627c28edab7c95749' 
  AND token = 'mtB+5027Xt8vznTMLjUCRVIxaN4+5g2RheRdZjL92kA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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