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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e61954a02730f4c5c482e2821cbacf246b8e886862a025ac7970b55e05968868' 
  AND token = '0eTAMMC9u2rEqg7mSgF+RF5HYKoojTqcBbnNogizi6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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