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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4519ae137d68b2b13bb425c0683cf2b83bd47914e7a132ae2c2f3d7ad9de15d' 
  AND token = 'kVZGp28AY4DBw4DaHLmmINY9B642JMti/nI4y9CBgIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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