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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b68151509c9872892b26bd59177ba6d3d9c69131a7bed53010eb67a1b9f133ae' 
  AND token = 'uy8d8eC6E4h7SKqCcjlIja7MRVuQmsdlvPx1ZLl8ELI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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