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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '882c58394be699a527dfb5fdabf2ea8f68994df8bcd675b057719648c15bafe3' 
  AND token = 'U2QPl4J9VdGcDo1g2zcztsoTWG7yYjxSxOSkv0y906c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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