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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f87ca1e093d9d5f9f7bd612ee011e3a5e9c6b31e588814751a5c7527ed775b70' 
  AND token = 'crD6B6Ai3QDY/KOp7x5010j1MyaE2NDiXpKOW797rL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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