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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67968b3ddbaef48cab119da197f56c2734d2d5274c95cfbb25c3a7bc3b1daa54' 
  AND token = 'cNwhlIYysyM8qDSbmNPk+SoE6MQgO1Tdj706HEcqrvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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