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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85d685c479af404a0a9b67a764cdefd452721c50682b2a2c2cbe4c934b43d330' 
  AND token = '2GVPrud9NesXc9AEgwkaali6/KBvH/OZG6Oq/i7v7vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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