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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ef06daaf620729fe1a15be6e5715b1e653555e88acac48703002ecbf7adadf' 
  AND token = '8sQaNgWoPtovdwnt5/EJD0IJH06KlrsYm3TiJ/Wt4g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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